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Old 22nd Aug 2014, 14:57
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Transsonic2000
 
Join Date: Jan 2006
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GNAV - Compressibility Factor
I'd need some help with the following question:

Aircraft is flying at FL 350 with Mach 0.878 OAT = ISA + 4°C. Compressibility Factor is 0.939. Calculate TAS.

Correct answer would be 510 kts.


Her are my steps, but my result doesn't even come close to the answer given.
  1. determine OAT at FL 350 = - 51°C
  2. calculate LSS = 0.878 (Mach) x 38.9 (square route out of) 222 = 508 kts
  3. 508 kts x 0.939 (C. Factor) = 478 TAS
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